Zumba, spinning, barre — fitness classes are the current workout craze. Find out what to expect at each and how to get a similar workout at home.

Bikram Yoga (Hot Yoga)

What it is: The 90-minute yoga class includes 26 hatha yoga postures and two pranayama breathing exercises. Commonly referred to as "hot yoga," Bikram is performed in a room heated to 105 degrees to ease the body into its most flexible state. Challenging the mind and body alike, this form of yoga focuses on the importance of oxygen flow and breathing.

Celebs who are fans: Demi Moore, Gisele Bündche, Jenny McCarthy

How to do it at home: Move a yoga mat into the bathroom and crank up the shower to raise the room’s temperature and humidity. Wear warm but loose-fitting clothing to maintain a high body temperature, and follow a Bikram yoga workout DVD, YouTube video, or Chaz Rough’s free YOGAmazing podcast.

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